Microsoft security update for CVE-2026-6409
🔗 CVE IDs covered (1)
📋 Microsoft's advisory
EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6409. This page also shows what EchelonGraph holds for CVE-2026-6409, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.
🎯 Affected products5
- azl3 mysql 8.0.45-2 on Azure Linux 3.0
- azl3 protobuf 25.3-6 on Azure Linux 3.0
- azl3 pytorch 2.2.2-12 on Azure Linux 3.0
- cbl2 protobuf 3.17.3-5 on CBL Mariner 2.0
- cbl2 protobuf 3.17.3-5 on CBL-Mariner 2.0
✅ Updates Microsoft lists: 2 updates
2 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.
| KB article | Update | Fixed build |
|---|---|---|
| — | Security Update | 25.3-7 |
| — | Security Update | — |
🧭 EchelonGraph on CVE-2026-6409
- EchelonGraph score
- 7.1 HIGH
- CISA KEV
- Not listed
- Fix status
- A fix is available — apply it.
Description from the CVE record (CVE.org), as published by its numbering authority
A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.
Published by Google LLC, the CVE Numbering Authority that assigned CVE-2026-6409, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).